Photo by Mohammad Rahmani on Unsplash
函式方法
變數 |
說明 |
constructor |
建構子 |
super |
上層類別 |
instanceof |
判斷是類為指定類別 |
建立類別
class Animal {
constructor(name, color){
this.name = name
this.color = color
}
sayHi(){
console.log(`[Animal] My name is「${this.name}」 My color is 「${this.color}」`);
}
}
const animal = new Animal('Dog','white');
// [Animal] My name is「Dog」 My color is 「white」
animal.sayHi()
繼承類別
class Cat extends Animal {
sayHi() {
console.log(`[Cat] My name is「${this.name}」 My color is 「${this.color}」`);
}
}
const KittyCat = new Cat('Kitty', 'pink');
// [Cat] My name is「Kitty」 My color is 「pink」
KittyCat.sayHi();
呼叫父類別方法
class Cat extends Animal {
sayHi() {
console.log(`[Cat] My name is「${this.name}」 My color is 「${this.color}」`);
super.sayHi();
}
}
const KittyCat = new Cat('Kitty', 'pink')
// [Cat] My name is「Kitty」 My color is 「pink」
// [Animal] My name is「Kitty」 My color is 「pink」
KittyCat.sayHi();
判斷是類為指定類別
console.log(KittyCat instanceof Cat) // true
console.log(KittyCat instanceof Animal) // true
Reference
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